Cloned from launchpad blueprint https://blueprints.launchpad.net/cinder/+spec/shared-volume. Description: Provide the ability to attach a single volume to multiple instances simultaneously. In order to do this R/W there are a number of issues involved with respect to data corruption etc. As a first pass it would be very useful to introduce a Read Only option that could be specified during attach and used to allow simultaneous attach to multiple instances. Most of this will require work in Nova/Compute but there will need to be some comprehension added to Cinder, and perhaps the ability to mark a volume as Read Only might be useful as well. This R/O volumes could be especially useful for things like Images and even D2D backups. There's also a need for FC environments to multi-attach in general. Specification URL (additional information): None
*** This bug has been marked as a duplicate of bug 1033180 ***